feat: convert secret-sources into a plugin (B20)

plugins/secret-sources/migrations/mysql/0001_adopt_secret_sources.sql

@@ -0,0 +1,15 @@
+-- secret-sources 0001: adopt_secret_sources
+-- Generated by termix-plugin migrations. Review before committing.
+
+CREATE TABLE IF NOT EXISTS `secret_sources` (
+  `id` varchar(255) PRIMARY KEY NOT NULL,
+  `user_id` varchar(255) NOT NULL,
+  `name` text NOT NULL,
+  `kind` text NOT NULL DEFAULT ('onepassword-connect'),
+  `base_url` text NOT NULL,
+  `shared` boolean NOT NULL DEFAULT false,
+  `created_at` text NOT NULL DEFAULT (CURRENT_TIMESTAMP),
+  `updated_at` text NOT NULL DEFAULT (CURRENT_TIMESTAMP),
+  FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE
+);
+RENAME TABLE `secret_sources` TO `p_secret_sources_sources`;